Surface-reflected seismic energy from underground explosions, in the form of a pP phase and a spall-closure (slapdown) phase, Ps, may contribute to the P wave and coda seen at teleseismic distances. In this report, delay times corresponding to pPP and PsP are estimated from surface-zero accelerograms for a number of U.S. underground nuclear explosions and are presented for use by the seismological community. When compared with published estimates, these pPP estimates are in reasonable agreement but the PsP estimates are at wide variance. No ready explanation is at hand for the disagreement.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.